Resin molded body and method of manufacturing same

Abstract

A resin molded body includes a polymeric material, such as one of a thermoplastic resin, a thermosetting resin, elastomer, and rubber, to which a required amount of ferromagnetic glittering agent having shape anisotropy is added. At a time when the polymeric material is in a molten resin state inside of a mold cavity, the polymeric material is subjected to the three-axis orientation control and orientation distribution control performed by applying a rotating magnetic field to the molten resin at a required position, adjusting an orientation of the ferromagnetic glittering agent mixed in the molten resin, and shifting the ferromagnetic glittering agent mixed in the molten resin in a required direction, and the ferromagnetic glittering agent mixed in the molten resin is then shifted to a design surface side to be thereby concentratedly distributed for orientation.

What is claimed is: 
     
         1 . A resin molded body including a polymeric material to which a required amount of ferromagnetic glittering agent having shape anisotropy is added, in which the polymeric material is one of a thermoplastic resin, a thermosetting resin, elastomer, and rubber,
 wherein, at a time when the polymeric material is in a molten resin state inside of a mold cavity, the polymeric material is subjected to the three-axis orientation control and orientation distribution control performed by applying a rotating magnetic field to the molten resin at a required position, adjusting an orientation of the ferromagnetic glittering agent mixed in the molten resin, and shifting the ferromagnetic glittering agent mixed in the molten resin in a required direction, and the ferromagnetic glittering agent mixed in the molten resin is then shifted to a design surface side to be thereby concentratedly distributed for orientation.   
     
     
         2 . The resin molded body according to  claim 1 , wherein a required amount of the ferromagnetic glittering agent added to the polymeric material is 0.1 to 10 wt %, and the ferromagnetic glittering agent is in a scale-like state and has an average particle diameter of 1 μm to 200 μm and an aspect ratio of 10 to 1,000. 
     
     
         3 . The resin molded body according to  claim 1 , wherein the three-axis orientation control is performed by applying the rotating magnetic field to the molten resin of the polymeric material to which the ferromagnetic glittering agent is added, and the orientation of the ferromagnetic glittering agent mixed in the molten resin is adjusted in a same direction. 
     
     
         4 . The resin molded body according to  claim 1 , wherein the orientation distribution control is performed by applying the rotating magnetic field to the molten resin of the polymeric material to which the ferromagnetic glittering agent is added, and imparting a magnetic field gradient in a plate thickness direction of the resin molded body, and the ferromagnetic glittering agent mixed in the molten resin is shifted to a vicinity of the design surface to be thereby concentratedly distributed for orientation. 
     
     
         5 . The resin molded body according to  claim 1 , wherein the rotating magnetic field is controlled by one of a rotator portion for a magnet, a rotator portion for the mold cavity, and a switching device for a magnetic field direction so as to directly or indirectly achieve a rotating speed of 200 rpm. 
     
     
         6 . A method of manufacturing a resin molded body, comprising:
 preparing one of a thermoplastic resin, a thermosetting resin, elastomer and rubber as a polymeric material to which a ferromagnetic glittering agent having shape anisotropy is added;   setting the polymeric material into a mold cavity;   bringing the polymeric material into a molten resin state during molding and processing of the polymeric material;   applying a rotating magnetic field to the molten resin; and   performing a three-axis orientation control involving adjusting an orientation of the ferromagnetic glittering agent mixed in the molten resin in a same direction to thereby form a resin molded body.   
     
     
         7 . The method of manufacturing a resin molded body according to  claim 6 , further comprising:
 bringing the polymeric material into the molten resin state during the molding and processing of the polymeric material;   applying the rotating magnetic field to the molten resin;   imparting a magnetic field gradient in a plate thickness direction of the resin molded body; and   performing an orientation distribution control so that the ferromagnetic glittering agent mixed in the molten resin is shifted and concentratedly distributed to one side to thereby form the resin molded body.